I got 1 half way decent one out of like 30, decent that the bond wires didn’t break, but still, silicone remains are hanging off the bond wires. All of the SST-40’s I got came from Kaidomian. I have 20 SST-40 N4 AD’s coming 12 of which are going to replace the XML’s in my TR-J20, the rest, I’ll try a different approach.
I think I have read that having little silicon left on the bond wires is just good because it protects them.
Not if you can see it in the beam. 
I think 18sixfifty has had some success, from what I gather, he slices and dices before chemical de-dome bath/soak.
The silicone dome has a heck of a hold on them bond wires. :rage: I have also had the chip coming off the pad on a few of them too! :person_facepalming:
Do post your build, I’ve got 2 of them and thought they needed a boost.
Boost it’s pulling 8 amps on a VTC5A, I thought I had something wrong at first, cause it would only pull 6+ amps, until i put a fully charged VTC5 and then a tried a VTC5A . I just swapped out the emitter/board in my M25C2 Turbo that had a FETDDdrv. in it. It’s a pretty intense BLUE-ISH spot, just kinda fuzzy and dark to one side, like casting a shadow from the silicone clinging on. Meh, I live with it, because I know what will happen! :person_facepalming:
Dales shaves them down to just above the phophorus and he’s getting like 9.4amps or more 2400-2600 lumens, something like that.
Maybe or could be, if they are weak, they might be damaged, I had a few that would light, go thru the levels a couple times and then burn out, some instantly and they still had the dome on, it was released from the base just not completely off, so I’m left wondering, was it the bond wires or was it the chip to the pad problem? Dunno?
you can see blown bond wires with magnification glass or macro function od a compact camera
Wow, even some of those from KD have badly solder flowed chips??
There’s no way the solvents cause the chips to fall off i.m.o.
On mine you could see it wasn’t soldered properly.
Whoa, that sounds like the KD ones are from a crappy batch too… 
Got my SST-40s from Shenzhen Great Technology Co.,Ltd, they appear legit. :+1:
Do you have a link?
Anyone know if I can use Sony vtc5a on my fenix TK75 quad modded with sst-40?
Sure but If you want the full power, you should mod the carrier.
https://www.aliexpress.com/item/10PCS-100PCS-Luminus-SST-40-10W-LED-1100lm-Cool-White-7000K-instead-of-CREE-XML2-XM/32819284669.html
Funny, it appears renamed to “GreatLED Store”.
I forgot to mention the carrier is modded., will post photo tonight… I just want to know if Sony vct5a are safe with sst40.
Ok here is my fenix tk75 quad sst40 dedome. Is Sony vtc5a safe to use in this light?
It’s possible you will blow the bond wires from too much current (~9.5A) if it’s direct drive and low circuit resistance. What is the voltage configuration and driver? And have you used other cells in the light successfully?
I think Newlumen’s light is modded by Vinh , with “driver vnx2” which is a fet driver .
I would use VTC6 to be safe…
Ask Vinh. He usually uses VTC5A…
Yes sir. The tk75vn is modded by Vinh. Probably drawing 4.5 amp from each cell… the Carrier is 4S… I like using Sony vtc5a. So far I have no problem using the highest mode with my vtc5a.
Either way, if the light break, he said he will fix it for free… so I don’t worry much…
It draws about 8-9 amps per cell .